Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ca1f1e8015cfdfb…

MALICIOUS

PDF

92.4 KB Created: 2021-09-16 21:12:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2027ee583b1c158292bb962409a93690 SHA-1: 07ecc7df73d709b6b3f4405164295af76f69c1f7 SHA-256: 2ca1f1e8015cfdfbf44ee8a325cc098d97432e7c575ed9593b2a7088f1442216
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9897

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://coretry.ru/uplcv?utm_term=free+robux+site+2021 PDF link annotation
    • http://xageunion.com/userfiles/file/radoxijevetovi.pdfIn PDF document text
    • https://luathoanghuy.com/uploads/files/2333369333.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/1115610565.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315ebb0e9f6---83450284709.pdfIn PDF document text
    • https://hoalavender.net/upload/files/levekonoredakugadonub.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/wakenuxurilo.pdfIn PDF document text
    • http://marcus-1.com/FileData/ckfinder/files/20210901_1348A69EA69A1E9F.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/rafukugopokopugem.pdfIn PDF document text
    • http://blossomtour.net/FileData/ckfinder/files/20210912_E98E4A4A5E203969.pdfIn PDF document text
    • https://angkaganjil.com/contents/files/dujewamivajisovapuvi.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/ferogavurenirizufesotag.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/68872607717.pdfIn PDF document text
    • http://smartwealthhk.com/userfiles/pudaxukufi.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/13364914932.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109072115452117.pdfIn PDF document text
    • https://fishuntpesca.it/file/39604403091.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/bifakegu.pdfIn PDF document text
    • http://uelzecht.lu/userfiles/files/xelepuvupenuxaxofusaradi.pdfIn PDF document text
    • https://vegastel.eu/components/com_mijoshop/opencart/image/data/files/75436684963.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/3508067920.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/guzip.pdfIn PDF document text
    • http://ndt-ultratech.com/files/30506635153.pdfIn PDF document text
    • http://guerrazzi.info/userfiles/files/37469273334.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/32029963121.pdfIn PDF document text
    • https://gitteszoneklinik.dk/ckfinder/userfiles/files/79500800435.pdfIn PDF document text
    • https://fainitelecommunication.com/public/editorfiles/file/tadajefuzawajomujanuwego.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/65c5d483aedf445e98c612b0ab014dfa/jetupuzipodis.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001030c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B23 10400 bytes
SHA-256: 2c3059ee08dccd7b613c6367c453ae01e4fd684d7406a4273d0afaf429a97101
font_02_sfnt_off000132e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132E4 18820 bytes
SHA-256: 8aa14209a7e88be0458db4390abc7d03dc33b87dcaf1fd7b3e834a48d454f75c